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4989：Summary

题目描述
Small W is playing a summary game. Firstly, He takes N numbers. Secondly he takes out every pair of them and add this two numbers, thus he can get N*(N - 1)/2 new numbers. Thirdly he deletes the repeated number of the new numbers. Finally he gets the sum of the left numbers. Now small W want you to tell him what is the final sum.
输入解释
Multi test cases, every case occupies two lines, the first line contain n, then second line contain n numbers a1, a2, ……an separated by exact one space. Process to the end of file.
[Technical Specification]
2 <= n <= 100
-1000000000 <= ai <= 1000000000
输出解释
For each case, output the final sum.
输入样例 
4
1 2 3 4
2
5 5
输出样例 
25
10
提示
Firstly small W takes any pair of 1 2 3 4 and add them, he will get 3 4 5 5 6 7. Then he deletes the repeated numbers, he will get 3 4 5 6 7, Finally he gets the sum=3+4+5+6+7=25.
来自杭电HDUOJ的附加信息
Recommend heyang
该题目是Virtual Judge题目，来自 杭电HDUOJ
题目来源 BestCoder Round #8
源链接： HDU-4989
最后修改于 2020-10-25T23:18:44+00:00 由爬虫自动更新
共提交 0 次
通过率 --%
时间上限 内存上限
2000/1000MS(Java/Others) 32768/32768K(Java/Others)